What will change if Google developers make modifications in the navigation interface?
A few Google users noticed another Google search interface: there were top down navigation, filters and search options. At this time, these search options and navigation are presented on the left hand side bar. With this new interface appeared new white space. Perhaps, Google will put Knowledge Graph results, new ads or Google+ results in this vacuity.
Here is an example of how this new interface looks and works:
Of course, it can turn to be another testing as Google is constantly changing user interface and search results day and night.